package _07自动装箱和拆箱_了解;

public class Student {
    //考试成绩
    int score1; //默认值是0
    Integer score2; //默认值是null
}

class Test{
    public static void main(String[] args) {
        Student s = new Student();
        System.out.println(s.score1); //0
        System.out.println(s.score2); //null
    }
}
